Eddy t



ures,letters, &c.chilled thereupon in the castit the figures to be produced upon that part of the figures to come in contact with it.

UNITED STATES PATENT OFFICE.

EDDY T. THOMAS, OF NEW YORK, N. Y.

NUMBERING SEWING- MACHINE CASTINGS.

SPECIFICATION formingpart of Letters Patent No. 251,745, dated January 3, 1882.

- Application filed April To all whom it may concern Be it known that I, EDDY T. THOMAS, of New York, county of New York, and State of New York, have invented an Improvement in Numbering Sewing-MachineCastings,ofwhich the following description, in connection with the accompanying drawings, is a specification.

This invention has for its object to provide sewing-machine and other castings-as, for instance, the frame or arm of the machine-with chilled or hardened figures, which cannot be readily cut away with a chisel or file, as would be the case were the said figures made of unchilled cast or malleable metal.

The invention consists in castings having designating characters-such as numbers, figin g, as hereinafter claimed.

To make castings which include my invention, I place in the loam in the flask an iron chill-plate, against which the molten metal poured into the said flask when casting the frame or other part to be cast runs, thereby hardening orchilling that portion ofthe molten metal which comes in contact with the said, chill-plate. This chill'plate will have cut into the sewing-machine which is to be cast in the flask; but, if desired, I may make the outlines of the figures in a thin layer of loam next the chill-plate, a portion of the chill-plate being exposed, to permit the molten metal forming Figure 1 represents, in longitudinal section, a flask containing a chill-plate and a pattern, which in practice will correspond in shape with the part of a sewing or other machine which, it is desired to reproduce as a casting. Fig. 2 is a similar view of a modification. Fig. 3 is a top plan view of the bed or frame, with the arm removed, of al sewingmachine numbered in accordance with my invention.

Referring to Fig. 1, a brepresent the upper and lower portions, and c the board, of a molders flask of usual construction.

I first lay the patternfupon the board 0, and fill the part b of the flask as deep with loam as the thickness of the pattern. After this I place the chillplate d on the pattern and fill the part b of the flask, and then I invert the part b on the board 0, as in the drawings Fig. 1. This 1, 1881. (No model) chill-plate d is provided with figures or characters in intaglio; but they may, if desired, be in relief. The loam in the inverted part b is then sanded, the top part, a, is applied to the flask, and the loam g is filled in and provided with run-holes h i in the usual manner. The

'partshavingallbeen properlytamped,theflask,

cesses in its face, made in the form of figures, will become chilled at such points, leaving a v series of chilled figures upon the cast-metal part of the frame-work of the machinefigures so hard or so thoroughly chilled that they cannot be chipped or filed off as were the figures on the frame-work produced by being cast in loam.

In Fig. 3 I have shown a bed or frame, k,

of a sewing-machine with the number 1 thereof ,75

cast upon it in chilled figures.

Providing a sewing-machine casting in this way with chilled figures is a matter of considerable importance, as it enables manufacturers of sewing-machines to keep track of the various machines put out by their agents to parties who pay but small installments thereon, and then subsequently deface the numbers in order that the machines, partly paid for, may not be traced when passed by them into other hands. These chill-numbers are a great safeguard to man ui'acturers, and prevent dishonest purchasers from disposing of machines which have not yet fully become their own property. a

It isobvious that, instead of forming the figures directly in the chill-plated, 1 may place a thin layerofloam between the chill-plate d and pattern f, as in Fig. 2, and when the pattern is removed I may indent or impress into and through the said thin layer of loamupon the chill-plate d, by means of type or otherwise, the figures or characters which it is desired to have produced in the casting to be made in thefiask.- By forming the said figures or characters in the said thin layer of loam, so as to cut through the said layer to the surface of the plate 61, the molten metal poured into the flask In testimony whereof I have signed my name will come in contact with the chill-plate d, as to this specification in the presence of two subto before described, and be chilled at such poin ts, scribing witnesses.

thus producing chilled figures in the casting. EDDY T THOHAS I claim A casting having an unchilled body and Witnesses: chilled designating characters in one piece SPENCER (lDo'lY,

with the body,asand for the purpose set forth. SAML. D. TOMPKINS. 

